Spur Gears & Rack Change Gears
Spur Gears & Rack
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Gear Theory

Guaranteed Same
Day Shipment



Boston Gear change gears are used primarily on machine tools to provide different cutting speeds while using a constant speed input. All Boston Gear change gears are manufactured with a double key to accept the compound steel bushings that connect two gears together, allowing them to spin on an intermediate shaft. The change gears we stock range from 20-tooth through 128-tooth gears, in one tooth increments, depending upon the diametral pitch, for a nearly infinite number of ratio possibilities. Be sure to ask for the Boston Gear compound steel bushings designed specifically for use with these gears.



Features and Benefits

  • With 20 to 128 teeth, our change gears offer an almost infinite number of ratio possibilities.
  • A PA of 14 1/2° ensures smooth, quiet operation.
  • These change gears are available in both steel and cast iron to suit a variety of application requirements.
  • Compound steel bushings specifically designed for these change gears are available to maximize performance.
  • Boston Gear's change gears are available via our Guaranteed Same Day Shipment Program to ensure timely delivery.

Sample Applications

  • Machine tools
  • Lathes
  • Drill presses
  • Feed drives
  • Indexing machines


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